Data: Gold mine for politics

In the US and also in the Netherlands the elections are at the door. The battle for the voter is loose. And the key to the election victory? Your personal information. Data Driven Campaigning is the most modern way to win the voter's voice. With data techniques, presidential candidates and political parties try to find out as much as possible about you. That way they know how they can best reach you and how they can best take their message to you. Your voice as a voter and your dates are worth gold. But how are those private data collected and is that not very privacy sensitive? How is it deployed in campaigning? How are your own data used to influence your voting behavior?